Hold one bar in each hand. Be sure to hold the collar end of the bar. Start with the bars at shoulder level. Squat down by pushing your hips back and keeping your knees out wide. You can do this with a narrow or wide stance.
While I wouldn't recommend doing this as a max effort exercise, it can be a great accessory exercise. Use a narrow stance if you want to build up the quads and glutes. Use a wide stance if you want to build up the hips.